#define FUSE_USE_VERSION 26

#include <sqlite3.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <fuse.h>
#include <tcl.h>

#define APPFS_CACHEDIR "/tmp/appfs-cache"

#define APPFS_DEBUG(x...) { fprintf(stderr, "[debug] %s:%i:%s: ", __FILE__, __LINE__, __func__); fprintf(stderr, x); fprintf(stderr, "\n"); }

struct appfs_thread_data {
	Tcl_Interp *interp;
	sqlite3 *db;
};

struct appfs_thread_data globalThread;

	APPFS_CPU_ALL,
	APPFS_CPU_AMD64,
	APPFS_CPU_I386,
	APPFS_CPU_ARM
} appfs_cpuArch_t;

typedef enum {
	APPFS_PATHTYPE_INVALID,
	APPFS_PATHTYPE_FILE,
	APPFS_PATHTYPE_DIRECTORY,
	APPFS_PATHTYPE_SYMLINK
} appfs_pathtype_t;

struct appfs_package {
	struct appfs_package *_next;

		Tcl_DecrRefCount(objv[i]);
	}

	ckfree((void *) objv);

	return(retval);
}

static int appfs_update_index(const char *hostname) {
	int tcl_ret;

	tcl_ret = appfs_Tcl_Eval(globalThread.interp, 2, "::appfs::getindex", hostname);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("Call to ::appfs::getindex failed: %s", Tcl_GetStringResult(globalThread.interp));

		return(-1);
	}

	return(0);
}

static int appfs_getfile(const char *hostname, const char *sha1) {
	return(0);
}

static int appfs_update_manifest(const char *hostname, const char *sha1) {
	int tcl_ret;

	tcl_ret = appfs_Tcl_Eval(globalThread.interp, 3, "::appfs::getpkgmanifest", hostname, sha1);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("Call to ::appfs::getpkgmanifest failed: %s", Tcl_GetStringResult(globalThread.interp));

		return(-1);
	}

	return(0);
}


#define appfs_free_list_type(id, type) static void appfs_free_list_ ## id(type *head) { \
	type *obj, *next; \
	for (obj = head; obj; obj = next) { \
		next = obj->_next; \
		ckfree((void *) obj); \
	} \

	return(0);
}

static struct appfs_package *appfs_getindex(const char *hostname, int *package_count_p) {
	struct appfs_package *head = NULL;
	char *sql;
	int index_ret, sqlite_ret;

	if (package_count_p == NULL) {
		return(NULL);
	}

	index_ret = appfs_update_index(hostname);
	if (index_ret != 0) {


		return(NULL);
	}

	sql = sqlite3_mprintf("SELECT package, version, sha1, os, cpuArch, isLatest FROM packages WHERE hostname = %Q;", hostname);
	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

	if (head != NULL) {
		*package_count_p = head->counter + 1;
	}

	return(head);
}

static int appfs_getchildren_cb(void *_head, int columns, char **values, char **names) {
	struct appfs_children **head_p, *obj;

	head_p = _head;

	obj = (void *) ckalloc(sizeof(*obj));

	snprintf(obj->name, sizeof(obj->name), "%s", values[0]);

	if (*head_p == NULL) {
		obj->counter = 0;
	} else {
		obj->counter = (*head_p)->counter + 1;
	}

	obj->_next = *head_p;
	*head_p = obj;

	return(0);
	
}

static struct appfs_children *appfs_getchildren(const char *hostname, const char *package_hash, const char *path, int *children_count_p) {
	struct appfs_children *head = NULL;
	char *sql;
	int index_ret, sqlite_ret, manifest_ret;

	if (children_count_p == NULL) {
		return(NULL);
	}

	index_ret = appfs_update_index(hostname);
	if (index_ret != 0) {
		return(NULL);
	}

	manifest_ret = appfs_update_manifest(hostname, package_hash);
	if (manifest_ret != 0) {
		return(NULL);
	}

	sql = sqlite3_mprintf("SELECT file_name FROM files WHERE package_sha1 = %Q AND file_directory = %Q;", package_hash, path);
	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

		return(NULL);
	}

	APPFS_DEBUG("SQL: %s", sql);
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_getchildren_cb, &head, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		return(NULL);
	}

	if (head != NULL) {
		*children_count_p = head->counter + 1;
	}

	return(head);
}

static int appfs_lookup_package_hash_cb(void *_retval, int columns, char **values, char **names) {
	char **retval = _retval;

	*retval = strdup(values[0]);

	return(0);
}

static char *appfs_lookup_package_hash(const char *hostname, const char *package, appfs_os_t os, appfs_cpuArch_t cpuArch, const char *version) {
	char *sql;
	char *retval = NULL;
	int index_ret, sqlite_ret;

	index_ret = appfs_update_index(hostname);
	if (index_ret != 0) {
		return(NULL);
	}

	sql = sqlite3_mprintf("SELECT sha1 FROM packages WHERE hostname = %Q AND package = %Q AND os = %Q AND cpuArch = %Q AND version = %Q;",
		hostname,
		package,
		appfs_convert_os_toString(os),
		appfs_convert_cpuArch_toString(cpuArch),
		version
	);
	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

		return(NULL);
	}

	APPFS_DEBUG("SQL: %s", sql);
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_lookup_package_hash_cb, &retval, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		return(NULL);
	}

	return(retval);
}

static int appfs_getfileinfo_cb(void *_pathinfo, int columns, char **values, char **names) {
	struct appfs_pathinfo *pathinfo = _pathinfo;
	const char *type, *time, *source, *size;

	type = values[0];
	time = values[1];
	source = values[2];
	size = values[3];

	pathinfo->time = strtoull(time, NULL, 10);

	if (strcmp(type, "file") == 0) {
		pathinfo->type = APPFS_PATHTYPE_FILE;
		pathinfo->typeinfo.file.executable = 0;
		pathinfo->typeinfo.file.size = strtoull(size, NULL, 10);

		return(0);
	}

	if (strcmp(type, "directory") == 0) {
		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
		pathinfo->typeinfo.dir.childcount = 0;

		return(0);
	}

	return(0);

	/* Until this is used, prevent the compiler from complaining */
	source = source;
}

static int appfs_getfileinfo(const char *hostname, const char *package_hash, const char *_path, struct appfs_pathinfo *pathinfo) {
	char *directory, *file, *path;
	char *sql;
	int index_ret, sqlite_ret, manifest_ret;

	if (pathinfo == NULL) {
		return(-EIO);
	}

	index_ret = appfs_update_index(hostname);
	if (index_ret != 0) {
		return(-EIO);
	}

	manifest_ret = appfs_update_manifest(hostname, package_hash);
	if (manifest_ret != 0) {
		return(-EIO);
	}

	path = strdup(_path);
	directory = path;
	file = strrchr(path, '/');
	if (file == NULL) {
		file = path;
		directory = "";
	} else {
		*file = '\0';
		file++;
	}

	sql = sqlite3_mprintf("SELECT type, time, source, size FROM files WHERE package_sha1 = %Q AND file_directory = %Q AND file_name = %Q;", package_hash, directory, file);
	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

		free(path);

		return(-EIO);
	}

	free(path);

	pathinfo->type = APPFS_PATHTYPE_INVALID;

	APPFS_DEBUG("SQL: %s", sql);
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_getfileinfo_cb, pathinfo, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		return(-EIO);
	}

	if (pathinfo->type == APPFS_PATHTYPE_INVALID) {
		return(-ENOENT);
	}

	return(0);
}

/* Get information about a path, and optionally list children */
static int appfs_get_path_info(const char *_path, struct appfs_pathinfo *pathinfo, struct appfs_children **children) {
	struct appfs_site *sites, *site;
	struct appfs_children *node, *dir_children;
	struct appfs_package *packages, *package;
	appfs_os_t os_val;
	appfs_cpuArch_t cpuArch_val;
	char *hostname, *packagename, *os_cpuArch, *os, *cpuArch, *version;
	char *path, *path_s;
	char *package_hash;
	int sites_count, packages_count, os_cpuArch_count, version_count, files_count;
	int fileinfo_ret;

	if (children) {
		*children = NULL;
	}

	if (_path == NULL) {
		return(-ENOENT);
	}

	if (_path[0] != '/') {
		return(-ENOENT);
	}

	if (_path[1] == '\0') {
		/* Request for the root directory */

		sites = appfs_getsites(&sites_count);

		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
		pathinfo->typeinfo.dir.childcount = sites_count;

		if (children) {

			for (site = sites; site; site = site->_next) {
				node = (void *) ckalloc(sizeof(*node));
				node->_next = *children;
				strcpy(node->name, site->name);
				*children = node;
			}
		}

		appfs_free_list_site(sites);

		return(0);
	}

	path = strdup(_path);
	path_s = path;

	hostname = path + 1;
	packagename = strchr(hostname, '/');

	if (packagename != NULL) {
		*packagename = '\0';
		packagename++;
	}

	packages = appfs_getindex(hostname, &packages_count);

	if (packages == NULL || packages_count == 0) {
		APPFS_DEBUG("Unable to fetch package index from %s", hostname);

		free(path_s);

		return(-ENOENT);
	}

	if (packagename == NULL) {
		/* Request for a single hostname */
		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
		pathinfo->typeinfo.dir.childcount = packages_count;

		if (children) {
			for (package = packages; package; package = package->_next) {
				node = (void *) ckalloc(sizeof(*node));
				node->_next = *children;
				strcpy(node->name, package->name);
				*children = node;
			}
		}

		appfs_free_list_package(packages);

		free(path_s);

		return(0);
	}

	os_cpuArch = strchr(packagename, '/');
	if (os_cpuArch == NULL) {
		/* Request for OS and CPU Arch for a specific package */
		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;

		os_cpuArch_count = 0;
		for (package = packages; package; package = package->_next) {
			if (strcmp(package->name, packagename) != 0) {
				APPFS_DEBUG("Skipping package named \"%s\", does not match requested package: \"%s\"", package->name, packagename);

				continue;
			}

			os_cpuArch_count++;

			if (children) {
				node = (void *) ckalloc(sizeof(*node));
				node->_next = *children;
				snprintf(node->name, sizeof(node->name), "%s-%s", appfs_convert_os_toString(package->os), appfs_convert_cpuArch_toString(package->cpuArch));
				*children = node;
			}
		}

		appfs_free_list_package(packages);

		free(path_s);

		pathinfo->typeinfo.dir.childcount = os_cpuArch_count;

		return(0);
	}

	*os_cpuArch = '\0';
	os_cpuArch++;

	version = strchr(os_cpuArch, '/');

	if (version != NULL) {
		*version = '\0';
		version++;
	}

	os = os_cpuArch;
	cpuArch = strchr(os_cpuArch, '-');
	if (cpuArch) {
		*cpuArch = '\0';
		cpuArch++;

		cpuArch_val = appfs_convert_cpuArch_fromString(cpuArch);
	} else {
		cpuArch_val = APPFS_CPU_UNKNOWN;
	}

	os_val = appfs_convert_os_fromString(os);

	if (version == NULL) {
		/* Request for version list for a package on an OS/CPU */
		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;

		version_count = 0;
		for (package = packages; package; package = package->_next) {
			if (strcmp(package->name, packagename) != 0) {
				APPFS_DEBUG("Skipping package named \"%s\", does not match requested package: \"%s\"", package->name, packagename);

				continue;
			}

			if (package->os != os_val) {
				continue;
			}

			if (package->cpuArch != cpuArch_val) {
				continue;
			}

			version_count++;

			if (children) {
				node = (void *) ckalloc(sizeof(*node));
				node->_next = *children;
				strcpy(node->name, package->version);
				*children = node;
			}
		}

		appfs_free_list_package(packages);

		free(path_s);

		pathinfo->typeinfo.dir.childcount = version_count;

		return(0);
	}

	appfs_free_list_package(packages);

	path = strchr(version, '/');
	if (path == NULL) {
		path = "";
	} else {
		*path = '\0';
		path++;
	}

	/* Request for a file in a specific package */
	APPFS_DEBUG("Requesting information for hostname = %s, package = %s, os = %s, cpuArch = %s, version = %s, path = %s", 
		hostname, packagename, os, cpuArch, version, path
	);

	package_hash = appfs_lookup_package_hash(hostname, packagename, os_val, cpuArch_val, version);
	if (package_hash == NULL) {
		free(path_s);

		return(-ENOENT);
	}

	APPFS_DEBUG("  ... which hash a hash of %s", package_hash);

	if (strcmp(path, "") == 0) {
		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
	} else {
		fileinfo_ret = appfs_getfileinfo(hostname, package_hash, path, pathinfo);
		if (fileinfo_ret != 0) {
			free(path_s);

			return(fileinfo_ret);
		}
	}

	if (pathinfo->type == APPFS_PATHTYPE_DIRECTORY) {
		dir_children = appfs_getchildren(hostname, package_hash, path, &files_count);

		if (dir_children != NULL) {
			pathinfo->typeinfo.dir.childcount = files_count;
		}

		if (children) {
			*children = dir_children;
		}
	}

	free(path_s);

	return(0);
}

static int appfs_fuse_getattr(const char *path, struct stat *stbuf) {
	struct appfs_pathinfo pathinfo;
	int res = 0;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	return(-ENOENT);
}

#ifdef APPFS_TEST_DRIVER
static int appfs_test_driver(void) {
	struct appfs_site *sites, *site;
	struct appfs_package *packages, *package;
	struct appfs_children *files, *file;
	char *sha1 = NULL;
	int packages_count = 0, sites_count = 0, files_count;

	sites = appfs_getsites(&sites_count);
	printf("Sites:\n");
	for (site = sites; site; site = site->_next) {
		printf("\tname = %s\n", site->name);
	}

	appfs_free_list_site(sites);

	packages = appfs_getindex("rkeene.org", &packages_count);
	if (packages == NULL || packages_count == 0) {
		fprintf(stderr, "Unable to fetch package index from rkeene.org.\n");

		return(1);
	}

	for (package = packages; package; package = package->_next) {
		sha1 = package->sha1;

		printf("Package:\n\tname = %s\n\tversion = %s\n\tsha1 = %s\n\tos = %s\n\tcpuArch = %s\n",
			package->name,
			package->version,
			package->sha1,
			appfs_convert_os_toString(package->os),
			appfs_convert_cpuArch_toString(package->cpuArch)
		);
	}

	files = appfs_getchildren("rkeene.org", sha1, "", &files_count);
	if (files == NULL) {
		fprintf(stderr, "Unable to list files in the last package.\n");

		return(1);
	}

	printf("Files:\n");
	for (file = files; file; file = file->_next) {
		printf("\t%s\n", file->name);
	}

	appfs_free_list_children(files);

	files = appfs_getchildren("rkeene.org", sha1, "tcl", &files_count);
	if (files == NULL) {
		fprintf(stderr, "Unable to list files in the last package.\n");

		return(1);
	}

	printf("Files:\n");
	for (file = files; file; file = file->_next) {
		printf("\ttcl/%s\n", file->name);
	}

	appfs_free_list_children(files);
	appfs_free_list_package(packages);

	return(0);
}
#else
static struct fuse_operations appfs_oper = {
	.getattr	= appfs_fuse_getattr,

		set fd [open $file]
		set pkgdata [read $fd]
		close $fd

		foreach line [split $pkgdata "\n"] {
			set line [string trim $line]





			if {$line == ""} {
				continue
			}

			set work [split $line ","]

			unset -nocomplain fileInfo